CN103826363A - Hot-plugging protection circuit for LED illuminating apparatus - Google Patents

Hot-plugging protection circuit for LED illuminating apparatus Download PDF

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Publication number
CN103826363A
CN103826363A CN201410042245.0A CN201410042245A CN103826363A CN 103826363 A CN103826363 A CN 103826363A CN 201410042245 A CN201410042245 A CN 201410042245A CN 103826363 A CN103826363 A CN 103826363A
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China
Prior art keywords
power tube
comparator
status latch
source electrode
output
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CN201410042245.0A
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CN103826363B (en
Inventor
白浪
黄必亮
任远程
周逊伟
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Joulwatt Technology Co Ltd
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Joulwatt Technology Hangzhou Co Ltd
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Priority to CN201410042245.0A priority Critical patent/CN103826363B/en
Priority to CN201610353599.6A priority patent/CN105960055B/en
Publication of CN103826363A publication Critical patent/CN103826363A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The invention relates to a hot-plugging protection circuit for an LED illuminating apparatus. The hot-plugging protection circuit comprises a current source, a filtering capacitor and an LED light string. The positive electrode of the current source is respectively connected with one end of the filtering capacitor and the anode of the LED light string; and the negative electrode of the current source and the other end of the filtering capacitor are grounded. In addition, the hot-plugging protection circuit also includes a power tube M1, a current detection unit, a state latch and a reset unit. The cathode of the LED light string is simultaneously connected with a drain electrode of the power tube M1; and a source electrode of the power tube M1 is connected with the current detection unit. The drain electrode of the power tube M1 and the source electrode of the power tube M1 form a conduction branch; the conduction branch is connected in series with the current detection unit; the output terminal of the current detection unit is connected with a reset terminal of the state latch; the reset unit is connected with a setting terminal of the state latch; and the output terminal of the state latch is connected with a grid electrode of the power tube M1. According to the invention, an instantaneous peak current generated by the hot plugging of the LED light string can be effectively reduced; and the LED service life is prolonged.

Description

For the hot plug protective circuit of LED luminaire
 
Technical field
The invention belongs to the drive unit of LED luminaire, relate to the protective circuit that a kind of LED drives.
Background technology
With reference to Fig. 1, traditional LED drive scheme, comprises current source 10, filter capacitor C1, LED lamp string; The output plus terminal of current source connects LED lamp string anode, and output negative terminal connects LED lamp string negative electrode, meets filter capacitor C1 between output plus terminal and negative terminal; If LED load open circuit, the output current of current source is 0, and output voltage will maintain its maximum output voltage, the forward conduction voltage that this voltage is greater than LED load while normally working.If now LED load accesses suddenly, the transient voltage at LED two ends equals the maximum output voltage of current source, and the immediate current of LED load will be much higher than safe current scope; And due to the effect of filter capacitor C1, LED lamp string stream will maintain a period of time, very big to the damage of LED.
The defect that existing LED drive circuit exists is: the moment peak current producing in the time of the hot plug of LED lamp string is excessive, damages LED.
Summary of the invention
Excessive and damage shorter deficiency of LED, useful life in order to overcome the moment peak current producing when the hot plug of LED lamp string of existing LED drive circuit, the moment peak current producing while the invention provides a kind of effective reduction LED lamp string hot plug, extend the LED hot plug protective circuit for LED luminaire in useful life.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of hot plug protective circuit for LED luminaire, comprise current source, filter capacitor and LED lamp string, the positive pole of described current source respectively with one end of described filter capacitor, LED lamp series winding connects, the negative pole of described current source, the equal ground connection of the other end of filter capacitor, described hot plug protective circuit also comprises power tube M1, current detecting unit, status latch and reset unit, described LED lamp string is connected with the drain electrode of power tube M1 simultaneously, the source electrode of described power tube M1 connects current detecting unit, described LED lamp string, the source electrode of the drain electrode of power tube M1 and power tube M1 forms conducting branch road, the described current detecting unit of connecting on described conducting branch road, the output of described current detecting unit is connected with the reset terminal of described status latch, described reset unit is connected with the set end of described status latch, the output of described status latch is connected with the grid of described power tube M1.
Further, described reset unit is voltage comparator, the negative terminal of described voltage comparator is connected with the first given threshold voltage end, and the anode of described voltage comparator is connected with the drain electrode of power tube M1, and the output of described voltage comparator is connected with the set end of described status latch;
Described current detecting unit comprises sampling resistor and comparator, ground connection after the source electrode of described power tube M1 is connected with described sampling resistor, the source electrode of described power tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with the second given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch.
Or: described current detecting unit comprises sampled power pipe M2 and current comparator, the grid of described power tube M1 is connected with the grid of described sampled power pipe M2, the source electrode of described power tube M1 be connected from the source electrode of described sampled power pipe M2, the anode of described current comparator is connected with given threshold current end, the negative terminal of described current comparator is connected with the drain electrode of sampled power pipe M2, and the output of described current comparator is connected with the reset terminal of described status latch;
Or: described reset unit is timer, and the output of described timer is connected with the set end of described status latch; Described current detecting unit comprises sampling resistor and comparator, ground connection after the source electrode of described power tube M1 is connected with described sampling resistor, the source electrode of described power tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch;
Or: the output of described status latch is connected with the Enable Pin of an operational amplifier, and the anode of described operational amplifier is connected with the 3rd given threshold voltage end, and the negative terminal of described operational amplifier is connected with the source electrode of power tube M1.
Further, described power tube M1 can be that PMOS pipe or NMOS manage, in the time that power tube is PMOS pipe, and the location swap of power tube and control circuit thereof and LED.
Further, described power tube M1 is triode or metal-oxide-semiconductor, the corresponding NMOS pipe of NPN type triode, the corresponding PMOS pipe of positive-negative-positive triode.
Further, described sampling resistor can be resistance or with the proportional metal-oxide-semiconductor of power tube M1.
Beneficial effect of the present invention is mainly manifested in: the moment peak current that can avoid original LED drive circuit to produce in the time of the hot plug of LED lamp string guarantees that the hot plug in the time that current source is worked of LED lamp string can normally be lighted simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing LED drive circuit.
Fig. 2 is the circuit diagram of the hot plug protective circuit for LED luminaire of the present invention.
Fig. 3 is a kind of schematic diagram of hot plug protective circuit.
Fig. 4 is the schematic diagram of another kind of hot plug protective circuit.
Fig. 5 is the schematic diagram of another kind of hot plug protective circuit.
Fig. 6 is the schematic diagram of another kind of hot plug protective circuit.
Fig. 7 is the schematic diagram of another kind of hot plug protective circuit.
Fig. 8 is the schematic diagram of another kind of hot plug protective circuit.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 2 ~ Fig. 8, a kind of hot plug protective circuit for LED luminaire, comprise current source 10, filter capacitor C1 and LED lamp string, the positive pole of described current source 10 respectively with one end of described filter capacitor C1, the anodic bonding of LED lamp string, the negative pole of described current source 10, the equal ground connection of the other end of filter capacitor C1, described hot plug protective circuit also comprises power tube M1, current detecting unit 20, status latch and reset unit 30, the negative electrode of described LED lamp string is connected with the drain electrode of switching tube M1 simultaneously, the source electrode of described switching tube M1 connects current detecting unit, described LED lamp string, the source electrode of the drain electrode of switching tube M1 and switching tube M1 forms conducting branch road, the described current detecting unit 20 of connecting on described conducting branch road, the output of described current detecting unit 20 is connected with the reset terminal of described status latch, described reset unit 30 is connected with the set end of described status latch, the output of described status latch is connected with the grid of described switching tube M1.
The present embodiment, on the basis of original LED drive circuit, has increased a power tube M1, current detecting unit 20, reset unit 30.The negative electrode of LED lamp string connects the drain electrode of power tube M1, and the source electrode of power tube M1 connects current detecting unit, and grid is by current detecting unit and reset unit co-controlling, and when startup, power tube M1 is defaulted as conducting operating state.Current detecting unit 20 detects the electric current that flows through power tube M1, be 0 or while being less than certain value when flowing through the electric current of switching tube M1, think that LED lamp string does not access luminaire, i.e. LED lamp string open circuit, the grid of current detecting unit 20 power ratio control pipe M1 is low level, and power tube M1 is closed; In the time that LED lamp is connected in series into luminaire, the grid of reset unit 30 power ratio control pipe M1 is high level, makes power tube M1 conducting.(Fig. 2)
Further, described reset unit 30 is voltage comparator, the negative terminal of described voltage comparator is connected with the first given threshold voltage end, and the anode of described voltage comparator is connected with the drain electrode of switching tube M1, and the output of described voltage comparator is connected with the set end of described status latch;
Described current detecting unit 20 comprises sampling resistor and comparator, ground connection after the source electrode of described switching tube M1 is connected with described sampling resistor, the source electrode of described switching tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with the second given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch.
In this scheme, reset unit 30 is a voltage comparator, the relatively threshold voltage V1 of power tube drain voltage and a setting, and its output connects the set end (S) of the preferential status latch of asserts signal; Current detecting unit 20 is a voltage comparator 201 and a current sense resistor RS, the voltage on voltage comparator 201 comparison current sense resistor RS and the threshold value V2 of a setting, and its output connects the reset terminal (R) of status latch; The output of status latch is defaulted as high level; In the time that comparator 201 detects that voltage on RS is less than V2, think LED lamp string open circuit, comparator 201 is exported the reset terminal (R) of high level to status latch, makes status latch output low level arrive the grid of power tube M1, and power tube is closed; The drain voltage that power tube M1 detected when voltage comparator 30 is during higher than V1, think LED lamp be connected in series into, comparator 30 is exported the set end (S) of high level to status latch, makes the grid of status latch output high level to power tube M1, by power tube conducting.(Fig. 3)
Or: current detecting unit can not be connected on described LED lamp string, the drain electrode of switching tube M1 and the source electrode of switching tube M1 and form conducting branch road, but detects the electric current of described conducting branch road by a certain proportion of sampled power pipe.
In this scheme, current detecting unit comprises sampled power pipe M2 and current comparator, the grid of described power tube M1 is connected with the grid of described sampled power pipe M2, the source electrode of described power tube M1 be connected from the source electrode of described sampled power pipe M2, the anode of described current comparator is connected with given threshold current end, the negative terminal of described current comparator is connected with the drain electrode of sampled power pipe M2, and the output of described current comparator is connected with the reset terminal of described status latch; Current comparator relatively flows through the electric current of sampled power pipe M2 and the current value I 1 of a setting, in the time that the electric current of sampling pipe M2 is less than I1, thinks LED lamp string open circuit, and current comparator output high level is to the reset terminal of status latch.(Fig. 4)
Or: described reset unit 30 is a timer.
In this scheme, timer produces the high level pulse at certain hour interval and outputs to the set end (S) of status latch, and when the reset terminal (R end) of status latch is while being high, its output is exported a high level pulse at interval of a period of time.When LED lamp is connected in series after luminaire, status latch output high level, by power tube M1 conducting, now has electric current and flows through M1, makes current detecting unit output low level, and then makes power tube M1 keep conducting.(Fig. 5)
Or: current detecting unit and reset unit can be direct power ratio control pipe, but carry out the grid of power ratio control pipe by an operational amplifier or other control circuits, and then control the electric current that flows through power tube.The output of described status latch is connected with the Enable Pin of operational amplifier, and the anode of described operational amplifier is connected with the 3rd given threshold voltage end, and the negative terminal of described operational amplifier is connected with the source electrode of switching tube M1.
In this scheme, current detecting unit and reset unit, by the grid of an operational amplifier power ratio control pipe M1, are controlled the maximum current that flows through M1 simultaneously.(Fig. 6)
Or: power tube M1 can be PMOS pipe.
In this scheme, the location swap of power tube and LED lamp string, the source electrode of PMOS pipe connects current detecting unit, and drain electrode connects the anode of LED lamp string; (Fig. 7)
Or: power tube M1 can be triode or metal-oxide-semiconductor, can use NPN type triode (N-type metal-oxide-semiconductor) or positive-negative-positive triode (P type metal-oxide-semiconductor).(Fig. 8)
In the present embodiment, in the time that LED lamp string does not access luminaire, by closing a controlled power tube, the output of prime driver is disconnected, when LED lamp string accesses suddenly luminaire, while being hot plug, then by opening power tube by the access of prime driver, the unnecessary voltage producing while bearing prime driver open-circuit working in the moment of access by power tube, therefore the moment peak current producing can avoid the hot plug of LED lamp string time guarantees that LED lamp string can normally be lighted in the time of hot plug simultaneously.
Content described in the embodiment of this specification is only enumerating of way of realization to inventive concept; protection scope of the present invention should not be regarded as only limiting to the concrete form that embodiment states, protection scope of the present invention also and conceive the equivalent technologies means that can expect according to the present invention in those skilled in the art.

Claims (4)

1. the hot plug protective circuit for LED luminaire, comprise current source, filter capacitor and LED lamp string, the positive pole of described current source respectively with one end of described filter capacitor, LED lamp series winding connects, the negative pole of described current source, the equal ground connection of the other end of filter capacitor, it is characterized in that: described hot plug protective circuit also comprises power tube M1, current detecting unit, status latch and reset unit, described LED lamp string is connected with the drain electrode of power tube M1 simultaneously, the source electrode of described power tube M1 connects current detecting unit, described LED lamp string, the source electrode of the drain electrode of power tube M1 and power tube M1 forms conducting branch road, the described current detecting unit of connecting on described conducting branch road, the output of described current detecting unit is connected with the reset terminal of described status latch, described reset unit is connected with the set end of described status latch, the output of described status latch is connected with the grid of described power tube M1.
2. the hot plug protective circuit for LED luminaire as claimed in claim 1, it is characterized in that: described reset unit is voltage comparator, the negative terminal of described voltage comparator is connected with the first given threshold voltage end, the anode of described voltage comparator is connected with the drain electrode of power tube M1, and the output of described voltage comparator is connected with the set end of described status latch;
Described current detecting unit comprises sampling resistor and comparator, ground connection after the source electrode of described power tube M1 is connected with described sampling resistor, the source electrode of described power tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with the second given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch.
3. the hot plug protective circuit for LED luminaire as claimed in claim 1, it is characterized in that: described reset unit is timer, described current detecting unit comprises sampling resistor and comparator, ground connection after the source electrode of described power tube M1 is connected with described sampling resistor, the source electrode of described power tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch;
The output of described status latch is connected with the Enable Pin of operational amplifier, and the anode of described operational amplifier is connected with the 3rd given threshold voltage end, and the negative terminal of described operational amplifier is connected with the source electrode of power tube M1.
4. the hot plug protective circuit for LED luminaire as described in one of claim 1 ~ 3, is characterized in that: described power tube M1 is triode or metal-oxide-semiconductor.
CN201410042245.0A 2014-01-28 2014-01-28 For the hot plug holding circuit of LED luminaire Active CN103826363B (en)

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CN201410042245.0A CN103826363B (en) 2014-01-28 2014-01-28 For the hot plug holding circuit of LED luminaire
CN201610353599.6A CN105960055B (en) 2014-01-28 2014-01-28 A kind of hot plug protection circuit for LED illuminator

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CN201410042245.0A CN103826363B (en) 2014-01-28 2014-01-28 For the hot plug holding circuit of LED luminaire

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CN107018594A (en) * 2017-04-07 2017-08-04 深圳迈睿智能科技有限公司 A kind of LED load guard method
CN111065184A (en) * 2019-12-16 2020-04-24 毛昭祺 Hot-pluggable LED driving power supply and control method thereof
CN114040542A (en) * 2021-11-22 2022-02-11 深圳康佳电子科技有限公司 Circuit for inhibiting current peak when LED lamp is subjected to PWM dimming, backlight source and television

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CN207572950U (en) * 2017-11-03 2018-07-03 深圳市博为光电股份有限公司 A kind of both-end is into the leakage protection circuit of electric LED lamp tube

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
CN107018594A (en) * 2017-04-07 2017-08-04 深圳迈睿智能科技有限公司 A kind of LED load guard method
CN107018594B (en) * 2017-04-07 2020-02-14 深圳迈睿智能科技有限公司 LED load protection method
CN111065184A (en) * 2019-12-16 2020-04-24 毛昭祺 Hot-pluggable LED driving power supply and control method thereof
CN114040542A (en) * 2021-11-22 2022-02-11 深圳康佳电子科技有限公司 Circuit for inhibiting current peak when LED lamp is subjected to PWM dimming, backlight source and television

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CN105960055A (en) 2016-09-21
CN105960055B (en) 2017-08-08

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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030

Patentee after: Jiehuate Microelectronics Co.,Ltd.

Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province

Patentee before: JOULWATT TECHNOLOGY (HANGZHOU) Co.,Ltd.